79 lines
2.2 KiB
Haskell
79 lines
2.2 KiB
Haskell
module Language.Elna.SymbolTable
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( Info(..)
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, ParameterInfo(..)
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, SymbolTable
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, builtInSymbolTable
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, empty
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, enter
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, fromList
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, lookup
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, member
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) where
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import Data.HashMap.Strict (HashMap)
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import qualified Data.HashMap.Strict as HashMap
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import Data.List (sort)
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import Data.List.NonEmpty (NonEmpty)
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import qualified Data.List.NonEmpty as NonEmpty
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import Data.Vector (Vector)
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import Language.Elna.Location (Identifier(..))
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import Language.Elna.Types (Type(..), intType, booleanType)
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import Prelude hiding (lookup)
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newtype SymbolTable = SymbolTable (HashMap Identifier Info)
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deriving (Eq, Show)
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instance Semigroup SymbolTable
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where
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(SymbolTable lhs) <> (SymbolTable rhs) = SymbolTable $ rhs <> lhs
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instance Monoid SymbolTable
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where
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mempty = empty
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builtInSymbolTable :: SymbolTable
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builtInSymbolTable = SymbolTable $ HashMap.fromList
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[ ("boolean", TypeInfo booleanType)
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, ("int", TypeInfo intType)
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]
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empty :: SymbolTable
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empty = SymbolTable HashMap.empty
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enter :: Identifier -> Info -> SymbolTable -> Maybe SymbolTable
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enter identifier info table@(SymbolTable hashTable)
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| member identifier table = Nothing
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| otherwise = Just
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$ SymbolTable
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$ HashMap.insert identifier info hashTable
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lookup :: Identifier -> SymbolTable -> Maybe Info
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lookup identifier (SymbolTable table) = HashMap.lookup identifier table
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member :: Identifier -> SymbolTable -> Bool
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member identifier (SymbolTable table) = HashMap.member identifier table
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fromList :: [(Identifier, Info)] -> Either (NonEmpty Identifier) SymbolTable
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fromList elements
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| Just identifierDuplicates' <- identifierDuplicates =
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Left identifierDuplicates'
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| otherwise = Right $ SymbolTable $ HashMap.fromList elements
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where
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identifierDuplicates = NonEmpty.nonEmpty
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$ fmap NonEmpty.head
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$ filter ((> 1) . NonEmpty.length)
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$ NonEmpty.group . sort
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$ fst <$> elements
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data ParameterInfo = ParameterInfo
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{ name :: Identifier
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, type' :: Type
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, isReferenceParameter :: Bool
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} deriving (Eq, Show)
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data Info
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= TypeInfo Type
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| VariableInfo Bool Type
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| ProcedureInfo SymbolTable (Vector ParameterInfo)
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deriving (Eq, Show)
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